Question

please help me out with this ques​

Answer 1

Answer:

when a mass m slides from height 20m

its velocity at lowest point is

v=√2gh

  =√(2*10*20)

   =20m/s

now,

let common velocity be V then from conservation of momentum

m*20+m*0=(m+m)V

20m/2m=V

V=10m/s

Answer 2

V = 10M/S IS YOUR ANSWER .....